GO语言练习：第二个工程--模拟音乐播放器
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1、代码
2、编译及运行
1、目录结构
1.1）
1
$ tree
2
.
3
├── mplayer.go
4
└── src
5
├── mlib
6
│ ├── manager.go
7
│ └── manager_test.go
8
└── mp
9
├── mp3.go
10 └── play.go
1.2）mlib库的代码
1.2.1）manager.go代码
1
package
library
2
3
import "errors"
4 5type MusicEntry struct {
6 Id string
7 Name string
8 Artist string
9 Genre string
10 Source string
11 Type string
12}
1314type MusicManager struct {
15 musics []MusicEntry
16}
1718 func NewMusicManager() * MusicManager {
19return &MusicManager {make( []MusicEntry, 0)}
20}
2122 func (m * MusicManager) Len() int {
23return len(m.musics);
24}
2526 func (m* MusicManager ) Get(index int) (music * MusicEntry, err error) {
27if index < 0 || index >= len(m.musics) {
28return nil, errors.New("Index out of range.")
29 }
3031return &m.musics[index], nil
32}
3334 func (m * MusicManager) Find (name string) * MusicEntry {
35if len(m.musics) == 0 {
36return nil
37 }
3839for _,m := range m.musics {
40if m.Name == name {
41return &m
42 }
43 }
44return nil
45}
4647 func (m * MusicManager) Add (music * MusicEntry) {
48 m.musics = append(m.musics, * music)
49}
5051 func (m * MusicManager) Remove (index int) * MusicEntry {
52if index < 0 || index >= len(m.musics) {
53return nil
54 }
55 removedMusic := &m.musics[index]
5657if index < len(m.musics) - 1 {
58 m.musics = append(m.musics[:index - 1], m.musics[index + 1:]...)
59 }elseif index == 0 {
60 m.musics = make([]MusicEntry, 0)
61 } else {
62 m.musics = m.musics[:index - 1]
63 }
6465return removedMusic
66}
6768 func (m * MusicManager) RemoveByName (name string) * MusicEntry {
69 var removedMusic * MusicEntry = nil
70 var iPos int = -1
71for i := 0; i < m.Len(); i++ {
72if m.musics[i].Name == name {
73 iPos = i
74break75 }
76 }
7778if iPos < 0 {
79return nil
80 }
8182 removedMusic = m.Remove(iPos)
8384return removedMusic
85 }
1.2.2）manager.go的测试代码manager_test.go
1
package
library
2
3
import
(
4 "testing"
5)
6 7 func TestOps(t * testing.T) {
8 mm := NewMusicManager()
9if mm == nil {
10 t.Error("NewMusicManager faild.");
11 }
12if mm.Len() != 0 {
13 t.Error("NewMusicManager faild, not empty")
14 }
15 m0 := &MusicEntry { "1", "My Heart Will Go On", "Celion Dion", "Pop", "http://qbox.me/24501234", "MP3" }
16 mm.Add(m0)
1718if mm.Len() != 1 {
19 t.Error("MusicManager.Add faild.")
20 }
2122 m := mm.Find(m0.Name)
23if m == nil {
24 t.Error("MusicManager.Find faild")
25 }
2627if m.Id != m0.Id ||
28 m.Name != m0.Name ||
29 m.Artist != m0.Artist ||
30 m.Genre != m0.Genre ||
31 m.Source != m0.Source ||
32 m.Type != m0.Type {
33 t.Error("MusicManager.Find() faild. Found item mismatch.")
34 }
3536 m, err := mm.Get(0)
37if m == nil {
38 t.Error("MusicManager.Get() faild.", err)
39 }
4041 m = mm.Remove(0)
42if m == nil || mm.Len() != 0 {
43 t.Error("MusicManager.Remove() faild.", err)
44 }
45 }
1.3）mp库代码
1.3.1）src/mp/mp3.go代码
1
package
mp
2
3
import
(
4 "fmt"
5 "time"
6)
7 8type MP3Player struct {
9 stat int10 progress int11}
1213type WAVPlayer struct {
14 stat int15 progress int16}
1718 func (p * MP3Player) Play (source string) {
19 fmt.Println("Playing MP3 music", source)
2021 p.progress = 0
2223for p.progress < 100 {
24 time.Sleep(100 * time.Millisecond)
25 fmt.Print(".")
26 p.progress += 10
27 }
28 fmt.Println("\nFinished playing", source)
29}
3031 func (p * WAVPlayer) Play (source string) {
32 fmt.Println("Playing WAV music", source)
3334 p.progress = 0
3536for p.progress < 100 {
37 time.Sleep(100 * time.Millisecond)
38 fmt.Print(".")
39 p.progress += 10
40 }
41 fmt.Println("\nFinished playing", source)
42 }
1.3.2）src/mp/play.go代码
1
package
mp
2
3
import "fmt"
4 5 type Player interface {
6 Play(source string)
7}
8 9func Play(source, mtype string) {
10 var p Player
1112switch mtype {
13case "MP3" :
14 p = &MP3Player{}
15case "WAV" :
16 p = &WAVPlayer{}
17default :
18 fmt.Println("Unsupported music type", mtype)
19return20 }
21 p.Play(source)
22 }
1.4）main package模块代码mplayer.go
1
package
main
2
3
import
(
4 "bufio"
5 "fmt"
6 "os"
7 "strconv"
8 "strings"
910 "mlib"
11 "mp"
12)
1314 var lib * library.MusicManager
15 var id int = 1
16 var ctrl, signal chan int1718func handleLibCommands(tokens []string) {
19switch tokens[1] {
20case "list" :
21for i := 0; i < lib.Len(); i++ {
22 e, _ := lib.Get(i)
23 fmt.Println(i + 1, ":", e.Name, e.Artist, e.Source, e.Type)
24 }
25case "add" :
26if len(tokens) == 7 {
27 id++
28 lib.Add(&library.MusicEntry { strconv.Itoa(id), tokens[2], tokens[3], tokens[4], tokens[5], tokens[6] })
29 } else {
30 fmt.Println("USAGE : lib add <name><artist><genre><source><type> (7 argv)")
31 }
32case "remove" :
33if len(tokens) == 3 {
34 lib.RemoveByName(tokens[2])
35 } else {
36 fmt.Println("USAGE: lib remove <name>")
37 }
38default :
39 fmt.Println("Unrecogized lib command: ", tokens[1])
40 }
41}
4243func handlePlayCommands(tokens []string) {
44if len(tokens) != 2 {
45 fmt.Println("USAGE : play <name>")
46return47 }
4849 e := lib.Find(tokens[1])
50if e == nil {
51 fmt.Println("The music", tokens[1], "does not exist.")
52return53 }
5455 mp.Play(e.Source, e.Type)
56}
5758func main() {
59 fmt.Println(`
60 Enter following commands to control the player:
61 lib list --View the existing music lib
62 lib add <name><artist><genre><source><type> -- Add a music to the music lib
63 lib remove <name> --Remove the specified music from the lib
64 play <name> -- Play the specified music
65 `)
66 lib = library.NewMusicManager()
6768 r := bufio.NewReader(os.Stdin)
6970for i := 0; i <= 100; i++ {
71 fmt.Print("Enter command-> ")
72 rawLine, _, _ := r.ReadLine()
7374 line := string(rawLine)
75if line == "q" || line == "e" {
76break77 }
78 tokens := strings.Split(line, " ")
7980if tokens[0] == "lib" {
81 handleLibCommands(tokens)
82 } elseif tokens[0] == "play" {
83 handlePlayCommands(tokens)
84 } else {
85 fmt.Println("Unrecognized command :", tokens[0])
86 }
87 }
88 }
2）编译及运行
2.1）设置环境GOPATH
$ export GOPATH="/home/normal/musicplayer"
2.2）编译
1 $ go build
2.3）查看编译后的目录结构
1
.
2
├── mplayer.go
3
├── musicplayer
4
└── src
5
├── mlib
6
│ ├── manager.go
7
│ └── manager_test.go
8
└── mp
9
├── mp3.go
10 └── play.go
2.4）运行
$ ./musicplayer Enter following commands to control the player: lib list --View the existing music lib lib add <name><artist><genre><source><type> -- Add a music to the music lib lib remove <name> --Remove the specified music from the lib play <name> -- Play the specified music Enter command-> lib add a b c d e Enter command-> lib list 1 : a b d e Enter command-> play a Unsupported music type e Enter command-> lib remove a Enter command-> lib add a b c d e MP3 USAGE : lib add <name><artist><genre><source><type> (7 argv) Enter command-> lib add a b c d MP3 Enter command-> lib list 1 : a b d MP3 Enter command-> play a Playing MP3 music d .......... Finished playing d Enter command-> q
注：代码来源《Go语言编程》第三章，代码结构与原书有差别
原文：http://www.cnblogs.com/fengbohello/p/4642376.html
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